Foliar, Physiologial and Growth Responses of Four Maple Species Exposed to Ozone

Responses of evergreen and deciduous Quercus species to enhanced ozone levels

“…Finally, plants growing in the Mediterranean area are adapted to different oxidative stress factors (e.g., high temperature, strong sun-light, drought) that can make them more tolerant to ozone stress, as molecular responses to all these stresses may be convergent (Paoletti, 2006;Bussotti, 2008;Calatayud et al, 2010). Overall, the results of the present study are consistent with previous studies comparing related Mediterranean evergreen and deciduous species, which showed a much higher tolerance in evergreen species , and also with other studies comparing different deciduous species among them: plants with smaller, more coriaceous and thicker leaves, withstood ozone stress better (Calatayud et al, 2007;Bussotti et al, 2007;Bussotti, 2008). The higher sensitivity of Q. pyrenaica is related to its large leaves, relatively thin, and high g max and POD Y values.…”

“…In Q. pyrenaica (2006 and 2007) and Quercus robur (2007), stomatal conductance (g s ) and the ratio between A/g s were also impaired. Similar physiological changes have been reported e.g., in maple species and in Pistacia and Viburnum shrubs (Calatayud et al, 2007. As these authors pointed out, the observed reductions of CO 2 assimilation are associated with an increase in C i and a reduction in WUE (or the related A/g s ), which suggest that Rubisco-related limitations may contribute to this decline in CO 2 assimilation (e.g., Reichenauer and Bolhàr-Nordenkampf, 1999;Mikkelsen, 1995).…”

Assessing the effects of ambient ozone in China on snap bean genotypes by using ethylenediurea (EDU)

“…As the intracellular impact of ozone in leaves depends both on the uptake of this pollutant through stomata and the detoxification capacity of the cells (Matyssek et al, 2008), differences in ozone sensitivity between plants could be related to stomatal conductance (Calatayud et al, 2007;Reich, 1987) and to constitutive antioxidant levels (Dizengremel et al, 2013;Feng et al, 2010b). The differences between tolerant and sensitive genotypes reported in the present study are only partially consistent with these premises.…”

“…Calatayud et al, 2010;Feng et al, 2011). The parallel reduction of fluorescence parameters F 0 v =F 0 m , ETR and qP under steady-state illumination in E-sensitive genotypes, may reflect a down-regulation process for adjusting the production of reductive power and chemical energy to a lower demand by the CalvineBenson cycle (Calatayud et al, 2007). Other studies have reported that even without significant effects on photosynthesis, EDU can protect plants from ozone growth reductions (Manning et al, 2011).…”

Physiological, anatomical and biomass partitioning responses to ozone in the Mediterranean endemic plant Lamottea dianae

“…In fumigated leaves, the significant reductions (with respect to control leaves) in A sat and A max were not well explained either by photoinhibitory damage (F v :F m not affected) (Maxwell & Johnson, 2000) or by stomatal limitations. Stomatal conductance and RSL were not significantly affected by ozone, C i increased and WUE declined, whereas reductions in C i and increases in WUE would be expected in stomata-limited gas exchange conditions (Reichenauer and Bolh ar-Nordenkampf, 1999;Calatayud et al, 2007). The clear decline in V c,max suggests that, in agreement with previous studies (e.g., Farage and Long, 1999), a reduction of the in vivo Rubisco carboxylation efficiency is one of the primary changes responsible for a decline in CO 2 assimilation in ozone-fumigated plants.…”